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EVAP 2-Way Valve Test

WARNING: This page is about a different car, the 2004 Acura 3.5RL, 2003 Acura 3.5RL, 2003 Acura 3.2TL, and 2003 Acura 3.2CL. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove fuel filler cap. Remove fuel tank vapor hoses from EVAP 2-way valve. For location of EVAP 2-way valve, see VACUUM DIAGRAMS article. Connect hose to available EVAP 2 way valve port from "T" fitting connected to a vacuum pump/gauge. See Fig 4 -Fig 3 .
  2. Slowly apply vacuum while observing vacuum/pressure gauge. Vacuum should stabilize (valve opens) momentarily at 0.2-0.6 in. Hg. If vacuum stabilizes within specified range, go to next step. If vacuum stabilizes less than or more than specified range, replace EVAP 2-way valve and retest.
  3. Move vacuum/pressure gauge from vacuum side to pressure side. See Fig 1 to Fig 4 . Slowly pressurize vapor line while observing gauge. Pressure should momentarily stabilize (valve opens) at greater than 0.3 in. Hg. If pressure stabilizes as specified, valve is okay. If pressure stabilizes at less than 0.3 in. Hg, replace EVAP 2-way valve and retest.
Fig 1: Testing EVAP 2-Way Valve (MDX)
G00070967Courtesy of AMERICAN HONDA MOTOR CO., INC.
Fig 2: Testing EVAP 2-Way Valve (3.2CL & 3.2TL)
G00070969Courtesy of AMERICAN HONDA MOTOR CO., INC.
Fig 3: Testing EVAP 2-Way Valve (3.5RL)
G00070970Courtesy of AMERICAN HONDA MOTOR CO., INC.
Fig 4: Testing EVAP 2-Way Valve (RSX)
G00070968Courtesy of AMERICAN HONDA MOTOR CO., INC.
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